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简介：
一、常用小数、分数的转化
1/2=0.5=50%
1/3≈0.333=33.3%
2/3≈0.667=66.7%
1/4=0.25=25%
3/4=0.75=75%
1/5=0.2=20%
1/6≈0.167=16.7%
5/6≈0.833=83.3%
1/8=0.125=12.5%
3/8=0.375=37.5%
5/8=0.625=62.5%
7/8=0.875=87.5%
1/9≈0.111=11.1%
1/10=0.1=10%
1/20=0.05=5%
1/16=0.0625=6.25%
1/32=0.03125=3.125%
1/64=0.015625=1.5625%
1/7≈0.143=14.3%
二、常用圆周率计算
3.14x1=3.14
3.14x2=6.28
3.14x3=9.42
3.14x4=12.56
3.14x5=15.70
3.14x6=18.84
3.14x7=21.98
3.14x8=25.12
3.14x9=28.26
3.14x10=31.40
3.14x11=34.54
3.14x12=37.68
3.14x16=50.24
3.14x18=56.52
3.14x20=62.80
3.14x25=78.50
3.14x32=100.48
3.14x36=113.04
3.14x49=153.86
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